Roasting System Gas Flow Segmentation for Emissions and Energy
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Solution Overview
Problem
Conventional food roasting systems, particularly those used for coffee beans, face challenges in reducing energy consumption and emissions, often relying on costly high-temperature incineration and ventilation systems that are not feasible in all settings, necessitating a more efficient and compact solution.
Innovation Solution
A roasting system with a recirculating gas flow path that includes a blower, variable diverter, and catalytic converter, allowing for controlled gas flow and temperature modulation, enabling efficient emissions treatment and energy management through a combination of a treated and bypass gas flow path, with a controller managing operating modes to optimize roasting chamber and catalytic converter temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If high-temperature incineration is used to treat emissions, then emissions are reduced, but energy consumption increases and system complexity increases
Solution Approach 1:
The gas flow path is divided into multiple segments: a recirculating path that returns treated gas to the roasting chamber, and a vent path that directs a portion of the gas stream to the catalytic converter for emissions treatment. This segmentation allows selective treatment of only the necessary portion of exhaust gases rather than treating the entire gas stream at high temperature.
Solution Approach 2:
A catalytic converter is introduced as an intermediary device between the roasting chamber and the environment. The converter uses catalysis to break down harmful emissions at lower temperatures than traditional incineration, reducing both energy consumption and system complexity while maintaining effective emissions control.
2Object-generated harmful factors
If high-temperature incineration is used to treat emissions, then emissions are reduced, but device complexity increases
Solution Approach 1:
The ventilation system is segmented into a recirculating gas flow path and a vent path with a variable diverter. This allows the system to reuse most of the exhaust gas for continued roasting while directing only a controlled portion to emissions treatment, simplifying the overall ventilation requirements compared to treating all exhaust at high temperature.
Solution Approach 2:
The catalytic converter serves as a compact intermediary device that handles emissions treatment independently of the main roasting system. This modular approach reduces system complexity by separating emissions treatment from the primary roasting function, avoiding the need for complex high-temperature incineration systems.
3Use of energy by moving object
If recirculating gas flow path is used, then energy efficiency improves, but temperature control difficulty increases
Solution Approach 1:
The variable diverter dynamically adjusts the split between the recirculating gas flow path and the vent path based on real-time conditions. This dynamic control allows the system to maintain optimal temperature in the roasting chamber by regulating the amount of recirculated heat while ensuring proper emissions treatment, simplifying temperature control despite the recirculating flow.
Solution Approach 2:
The controller receives feedback on the state of the gas stream and adjusts the variable diverter position accordingly. This feedback mechanism enables automatic temperature control by modulating the recirculation rate, maintaining energy efficiency while eliminating the difficulty of manual temperature management in a recirculating system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces energy consumption, minimizes noxious gas emissions, and maintains optimal catalytic converter temperatures while allowing for compact and efficient operation, enhancing both emissions control and thermal efficiency in the roasting process.
Implementation Method 1
The treated flow path includes a series arrangement of a gas heater and a catalytic converter
Implementation Method 2
The treated flow path includes a series arrangement of a gas heater and a catalytic converter
Implementation Method 3
The blower is configured to provide a flow stream of gas through the recirculating gas flow path
Implementation Method 4
The cyclonic separator removes fragments and/or particles of debris from the flow stream
Data Source
AI summary
A bean roasting system includes a roasting chamber, a blower, a variable diverter and a controller. The roasting chamber, the blower and the variable diverter each is disposed at least partially within a recirculating gas flow path. The blower is configured to provide a flow stream of gas through the recirculating gas flow path. The variable diverter is configured to split the gas flow path into at least two flow paths including a treated flow path and a bypass flow path. The treated flow path includes a series arrangement of a gas heater and a catalytic converter. The variable diverter is configured to control a percentage of a flow stream of gas that is diverted into the bypass flow path. The controller is configured to activate different predetermined operating modes for the bean roasting system by controlling a state of the variable diverter and a state of the heater.